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Improve the documentation about commit_delay.

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Clarify the docs explaining what commit_delay does, and add a
recommendation about a useful value for it, namely half of the single-page
fsync time reported by pg_test_fsync.  This is informed by testing of
the new-in-9.3 implementation of commit_delay; in prior versions it
was far harder to arrive at a useful setting.

In passing, do some wordsmithing and markup-fixing in the same general
area.

Also, change pg_test_fsync's default time-per-test from 2 seconds to 5.
The old value was about the minimum at which the results could be taken
seriously at all, and so seems a tad optimistic as a default.

Peter Geoghegan, reviewed by Noah Misch; some additional editing by me
This commit is contained in:
Tom Lane
2013-03-15 17:41:47 -04:00
parent dcafdbcde1
commit 70ec2f8f43
4 changed files with 118 additions and 70 deletions
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2
contrib/pg_test_fsync/pg_test_fsync.c
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@ -60,7 +60,7 @@ do { \
static const char *progname;
static int secs_per_test = 2;
static int secs_per_test = 5;
static int needs_unlink = 0;
static char full_buf[XLOG_SEG_SIZE],
*buf,